script to get, unpack, build and install modules from CPAN

It requires zero configuration, and stands alone. It also has a very low memory
footprint compared to similar software: when running, it requires only 10MB of
RAM.

It installs to wherever ExtUtils::MakeMaker and Module::Build are
configured to. So if you're using local::lib, then it installs to your
local perl5 directory. Otherwise it installs to the siteperl directory.

cpanminus at a boot time checks whether you have configured local::lib,
or have the permission to install modules to the sitelib directory. If
neither, it automatically sets up local::lib compatible installation
path in a perl5 directory under your home directory.